build(deps-dev): update postcss

Author: iOvergaard

package-lock.json

@@ -94,11 +94,11 @@
     "lit-html": "2.3.1",
     "npm-check-updates": "16.0.0",
     "plop": "3.1.1",
-    "postcss": "8.4.14",
+    "postcss": "8.4.16",
     "postcss-advanced-variables": "3.0.1",
     "postcss-cli": "10.0.0",
     "postcss-color-function": "4.1.0",
-    "postcss-custom-properties": "12.1.8",
+    "postcss-custom-properties": "12.1.9",
     "postcss-jsx": "0.36.4",
     "postcss-load-config": "4.0.1",
     "postcss-syntax": "0.36.2",